Improvement in the manufacture of dressing-rolls



UNITED STATES PATENT OFFICE.

CHARLES MGBURNEY, OF ROXBURY, MASSACHUSETTS.

Specification forming part of Letters Patent N 0. 53,465, dated March27, 1866.

To all whom it may concern.-

Be it known that I, CHARLES MOBURNEY, of Roxbury, in the county ofNorfolk and State of Massachusetts, have invented certain new and usefulImprovements in Dresser-Rolls and in the Preparation of the Semi-Elastic(J0mpounds thereof; and I hereby declare the following to be a full,clear, and exact description of the same.

I have invented a rubber compound possessiug the requisite propertiesfor dresser-rolls and like purposes, which I designate by the name ofsemi-elastic rubber, and which, to my knowledge, has not been used forthe purpose of covering rolls or for similar purposes.

Dresser-rolls have been made of metal or soapstone covered with woolencloth, of soft vulcanized rubber, and of vulcanite or hard rubber. Allof these are defective, and their continued use is open to objections.

The rolls are used always by pairs, the yarn to be dressed passingbetween them as they revolve for the purpose of pressing all surplusdressing ofl, and in order to do this the more effectually it isnecessary that one or both of the rolls should have a slightly elasticsurface. To obtain this surface a fine woolen jacket or covering hasbeen tried on the rolls. These coverings become saturated with thestarch or dressing,rot,require frequent renewal, and consequently arevery expensive. Soapstone rolls soon become indented by the thread oryarn, thus requiring frequent polishing, and wearing out very soon. Thevulcanite is too hard, besides being very expensive, thus excluding itsextensive application. Metal rolls covered with soft vulcanized rubberhave been tried; but the objections to these are the extreme elasticityof the rubber and its liabi ity to decompose from the action of thestarch becoming very soft and sticky. That is required is an inexpensivematerial to cover iron rolls with, possessing a limited amount ofelasticity, which will resist the action of the starch, which issometimes acid, and has a decomposing influence on most fibrousmaterials.

That my invention may be understood and used by those skilled in the artof manufacturing rubber goods, I will give in detail a full and completedescription of the compound and the mode of covering and finishing therolls.

The compound is as follows: Twelve pounds of gum, twelve pounds rubber,coated rags, or

trimmings, such as always abound in rubberfactories, fifteen to twentypounds flour of sulphur, four to six pounds oxide of zinc or othermetallic oxide used in manufacturing rubber compounds. These materialsare then ground or mixed into one mass by any of the usual methods oftreating gum. The composition is then rolled out into sheets of anyrequired thickness Multiplied thicknesses are then wrapped onto the ironor other metal rolls till the required size: is obtained. Several pliesof cotton or linen cloth are wrapped tightly around the roll for thepurpose of keeping it in the desired shape during the heating orvulcanizing process. The roll thus covered is then submitted to thisprocess of heating by steam, the heat lasting from two to four hours ata temperature of from 250 to 275 Fahrenheit. By this process thecompound is firmly attached to the iron rolls and the required hardnessis obtained. 1 t is then turned in a lathe or ground by emeuv-wheels toa perfectly uniform and given size and to a smooth though not polishedsurface. Thus is produced a roll possessinga limited amount ofelasticity capable of resisting the action of acid, starch, or othersolvents, also having the very desirable qualities of squeezing out allthe surplus dressing in a more perfect manner than any of the rollsheretofore used, and of not flattening the yarn.

I do not claim the covering of rolls with vulcanized rubber; nor do Iclaim the heating process; nor do I confine myself strictly to theproportions of ingredients above given, as they may be varied more orless.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The covering of metal rolls with a semielastic vulcanized-rubbercompound for dresser-rolls and for similar purposes, as set forth.

2. As a new article of manufacture, rolls for dressing yarn and otherlike purposes, composed of a metal-shaft or roll covered with asemi-elastic vulcanized compound having the properties requisite tooperate as herein set forth.

In testimony whereof I have signed my name to this specification beforetwo subscribing witnesses.

CHARLES McBUBNEY. Witnesses: 1

H. H. McBURNEY, JAMES WILSON.

